Ever since I had my rearend installed, my car has been making this random metal-on-metal squeal sound coming from the rear passenger-side wheel area. There isn't any one thing that will cause the sound to happen, but I have noticed that it will do it if I floor it, and when I go up the incline into my driveway slowly(sometimes). I was thinking it might be a rotor issue, or maybe the e-brake cable is too tight causing it to be slightly engaged all the time. I should point out that just over a year ago the pads were replaced and the rotors were resurfaced. Your thoughts?